Pressed paperboard bowl with wide upper rim

Abstract

A disposable bowl press-formed from a generally planar paperboard blank. The bowl has a large capacity, wide flange for easy handling and exhibits excellent rim stiffness. The bowl can include a bottom panel, a sidewall extending upwardly and outwardly from the bottom panel and a flange extending outwardly from the sidewall. The flange includes a rim portion having an arched central crown with a convex upper surface defining a radius of curvature RC of 0.650 to 1.180; and annular transition from the rim portion defining a radius of curvature, R 3 , and an evert extending downwardly from the annular transition, R 3 , wherein the bowl has an outermost diameter D of about 8″ to about 10″ and a height to diameter ratio, H/D, of from 0.18 to 0.20.

What is claimed is: 
     
       1. A disposable bowl press-formed from a generally planar paperboard blank, comprising:
 (a) a bottom panel; 
 (b) a first annular transition from the bottom panel defining a first radius of curvature, R 1 ; 
 (c) a sidewall extending upwardly and outwardly from the first annular transition; 
 (d) a second annular transition from the sidewall defining a second radius of curvature, R 2 ; and 
 (e) a flange extending outwardly from the second annular transition portion, the flange comprising: 
 (1) a rim portion having an arched central crown with a convex upper surface defining a radius of curvature, RC; 
 (2) a third annular transition from the rim portion defining a third radius of curvature, R 3 , 
 (3) an evert extending downwardly from the third annular transition, 
 wherein the bowl has an outermost diameter, D, of about 8″ to about 10″ and a height to diameter ratio, H/D, of from 0.18 to 0.20; and 
 (4) a flange width, W, that is a distance between intersecting points of a horizontal line extending through the sidewall and the outermost diameter D, wherein a ratio of the flange width to RC (W:RC) is 0.50 to 1.00. 
 
     
     
       2. The disposable bowl of  claim 1 , wherein a ratio of R 2  to RC (R 2 :RC) is 0.050 to 0.150 . 
     
     
       3. The disposable bowl of  claim 1 , wherein a ratio of R 3  to RC (R 3 :RC) is 0.050 to 0.150. 
     
     
       4. The disposable bowl of  claim 1 , wherein R 2  is equal to R 3 . 
     
     
       5. The disposable bowl of  claim 1 , wherein R 2  is not equal to R 3 . 
     
     
       6. The disposable bowl of  claim 1 , wherein the ratio of the flange width to RC (W:RC) is 0.52 to 0.92. 
     
     
       7. The disposable bowl of  claim 1 , wherein a ratio of the flange width to H (W:H) is 0.30 to 0.40. 
     
     
       8. The disposable bowl of  claim 1 , wherein a ratio of the flange width to H (W:H) is 0.32 to 0.37. 
     
     
       9. The disposable bowl of  claim 1 , wherein a ratio of the flange width to D (W:D) is 0.055 to 0.075. 
     
     
       10. The disposable bowl of  claim 1 , wherein a ratio of the flange width to D (W:D) is 0.060 to 0.070. 
     
     
       11. The disposable bowl of  claim 1 , wherein a volume of the bowl is greater than 30 fluid ounces. 
     
     
       12. The disposable bowl of  claim 1 , wherein the bottom panel has an arched central crown with a convex upper surface. 
     
     
       13. The disposable bowl of  claim 12 , wherein a portion of the arched central crown of the bottom panel defines a substantially continuous, convex arched profile spanning at least 75% of the horizontal distance between the center of the bottom panel and the first annular transition. 
     
     
       14. The disposable bowl of  claim 1 , wherein the sidewall is generally straight. 
     
     
       15. The disposable bowl of  claim 14 , wherein a first end of the generally straight sidewall is adjacent the first annular transition and a second end of the generally straight sidewall is adjacent the second annular transition. 
     
     
       16. The disposable bowl of  claim 1 , wherein the bottom panel has a generally planar upper surface. 
     
     
       17. A disposable bowl press-formed from a generally planar paperboard blank, comprising:
 (a) a bottom panel; 
 (b) a first annular transition from the bottom panel defining a first radius of curvature, R 1 ; 
 (c) a sidewall extending upwardly and outwardly from the first annular transition; 
 (d) a second annular transition from the sidewall defining a second radius of curvature, R 2 ; and 
 (e) a flange extending outwardly from the second annular transition portion, the flange comprising: 
 (1) a rim portion having an arched central crown with a convex upper surface defining a radius of curvature, RC, of 0.650″ to 1.180″; 
 (2) a third annular transition from the rim portion defining a third radius of curvature, R 3 , 
 (3) an evert extending downwardly from the third annular transition, and 
 (4) a flange width, W, that is a distance between intersecting points of a horizontal line extending through the sidewall and an outermost diameter, D, of the bowl, wherein a ratio of the flange width to RC (W:RC) is 0.50 to 1.00, the outermost diameter, D, is about 8″ to about 10″, and a height to diameter ratio (H:D) is from 0.18 to 0.20. 
 
     
     
       18. The disposable bowl of  claim 17 , wherein a ratio of the flange width to H is 0.30 to 0.40 and a ratio of the flange width to outermost diameter D is 0.055 to 0.075. 
     
     
       19. The disposable bowl of  claim 17 , wherein a volume of the bowl is greater than 30 fluid ounces. 
     
     
       20. A disposable bowl press-formed from a generally planar paperboard blank, comprising:
 (a) a bottom panel; 
 (b) a first annular transition from the bottom panel defining a first radius of curvature, R 1 ; 
 (c) a sidewall extending upwardly and outwardly from the first annular transition; 
 (d) a second annular transition from the sidewall defining a second radius of curvature, R 2 ; and 
 (e) a flange extending outwardly from the second annular transition portion, the flange comprising: 
 (1) a rim portion having an arched central crown with a convex upper surface defining a radius of curvature, RC, of 0.650″ to 1.180″; 
 (2) a third annular transition from the rim portion defining a third radius of curvature, R 3 , 
 (3) an evert extending downwardly from the third annular transition, and 
 (4) a flange width, W, that is a distance between intersecting points of a horizontal line extending through the sidewall and an outermost diameter, D, of the bowl, 
 wherein:
 a ratio of R 2  to RC (R 2 :RC) is 0.050 to 0.150, 
 a ratio of the flange width to RC (W:RC) is 0.50 to 0.92, 
 a ratio of the flange width to bowl height (W:H) is 0.30 to 0.40, 
 a ratio of the flange width to outermost diameter D (W:D) is 0.060 to 0.070, 
 the bowl has an outermost diameter D of about 8″ to about 10″, 
 the bowl has a height to diameter ratio, H/D, of from 0.18 to 0.20, and 
 the bowl has a volume that is greater than 30 fluid ounces.